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Nano platinum catalyst taking carbon nano tube as carrier and preparation method of nano platinum catalyst

A technology of carbon nanotubes and nano-platinum, which is applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low surface loading of Pt catalysts and poor catalytic activity of materials, so as to improve electrical conductivity and chemical stability, Effect of improving dispersion and enhancing overall performance

Active Publication Date: 2021-07-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the hydrophobicity of the CNT surface, the loading of Pt catalyst on its surface is low, which makes the catalytic activity of the material poor.

Method used

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  • Nano platinum catalyst taking carbon nano tube as carrier and preparation method of nano platinum catalyst
  • Nano platinum catalyst taking carbon nano tube as carrier and preparation method of nano platinum catalyst
  • Nano platinum catalyst taking carbon nano tube as carrier and preparation method of nano platinum catalyst

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preparation example Construction

[0034] The preparation steps of the present invention are described in detail as follows:

[0035] The first step is to use carbon nanotubes as the carrier, potassium permanganate as the manganese source, and stir and react at a constant temperature of 60-90°C in an aqueous solution for 1-10 hours, so that a layer of hydrophilic hydrated manganese oxide coating is uniformly grown on the surface of the carbon nanotubes. cladding.

[0036] In the second step, the manganese oxide-coated carbon nanotubes in the first step are heat-treated, and fired at 300-600° C. in an inert / reducing atmosphere to obtain a manganese tetraoxide coating layer with a lower valence state as Functionalized layer on the surface of carbon nanotubes.

[0037] In the third step, the surface functionalized carbon nanotube carrier in the second step is soaked in the platinum-containing aqueous solution, and stirred and reacted at a constant temperature of 50-90°C for 1-5h, so that the high-valent platinum ...

Embodiment 1

[0041] The preparation method described in the present invention is shown as figure 1 shown. Soak 0.1 g of ordered carbon nanotube array film in 50 mL of water, add 0.1 g of potassium permanganate, fully dissolve, heat and react in a water bath at 60°C for 2.5 h, then take out the film, wash and dry it. The dried precursor membrane was baked at 400°C for 2h in an argon atmosphere, and then soaked in 25mL of aqueous solution of chloroplatinic acid. The theoretical feed ratio of platinum raw materials was set at 20wt%, and the reaction was carried out at a constant temperature of 70°C for 2h. The nano-platinum particles are replaced by trimanganese tetraoxide, deposited on the surface of the carbon nanotube coating layer, and finally the membrane is taken out for washing and drying to obtain the Pt20 / Mn 3 o 4 / VACNT composite catalyst material. figure 2 An electron microscope image of the material is shown in , from which it can be seen that the loading on Mn 3 o 4 The dis...

Embodiment 2

[0043]Soak 1.0 g of commercial multi-walled carbon nanotube powder in 100 mL of water, add 1.0 g of potassium permanganate, fully dissolve, heat and react in a water bath at 90°C for 1 h, then filter with suction, wash and dry. The dried powder was calcined at 300° C. for 6 h under nitrogen atmosphere. Comparison of XRD crystal structure characteristic curves of MWCNT samples with manganese oxide functionalized coating before and after reduction roasting image 3 As shown, it can be seen that the product after reduction and roasting has an obvious crystal phase of Mn3O4. Then, the thermally reduced Mn 3 o 4 / MWCNT composite is soaked in 250mL aqueous solution of chloroplatinic acid, the theoretical feed ratio of platinum raw material is set to 10wt%, and the constant temperature is reacted at 50°C for 5h, so that the nano-platinum particles are replaced by trimanganese tetraoxide and deposited on the carbon nanotube-coated layer surface, and finally the product is taken out...

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Abstract

The invention relates to a nano platinum catalyst which is used for oxygen reduction electrochemical reaction of a fuel cell and takes a carbon nano tube as a carrier and a preparation method of the nano platinum catalyst. The carbon nano tube carrier is characterized in that the surface of the carbon nano tube carrier is covered with a manganese oxide hydrophilic functional layer growing in situ, and platinum nano particles are uniformly dispersed on the manganese oxide hydrophilic functional layer, and forma composite crystal phase with the manganese oxide hydrophilic functional layer. The preparation method is characterized by utilizing the manganese oxide functional layer covering the surface of the carbon nano tube to enable platinum ions in a liquid phase and manganese in a lower valence state to generate replacement reaction, so that a nano platinum atomic layer is uniformly deposited on manganese oxide to be formed. The preparation method is simple in process, and the synthesized catalyst is high in oxygen reduction performance and has a good industrial application prospect.

Description

technical field [0001] The invention relates to an oxygen reduction catalyst for a hydrogen fuel cell and a manufacturing method thereof, belonging to the technical field of fuel cell catalysts. Background technique [0002] Hydrogen fuel cell is an important energy conversion device in the future hydrogen society, which can efficiently convert hydrogen energy into electric energy, and can achieve zero carbon emissions in the process. In the research and development process of hydrogen fuel cells, an important aspect is to develop fuel cell electrode catalysts with high oxygen reduction activity, low noble metal usage, and long service life. [0003] The existing XC-72R activated carbon, which is mainly used for Pt catalyst loading, has good electrical conductivity, but there are problems such as reduced specific surface area after surface treatment and low loading capacity. In the non-patent literature (Xue Shi. Research on platinum nanoparticle catalyst support based on...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/90
CPCH01M4/926H01M4/9016Y02E60/50
Inventor 周嵬孟宪涛冉然邓翔邵宗平
Owner NANJING UNIV OF TECH
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